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Description

Sanitizes a string key.

Keys are used as internal identifiers. Lowercase alphanumeric characters, dashes, and underscores are allowed.

Usage

$string = sanitize_key( $key );

Parameters

$key

( string ) required – String key.

Returns

string Sanitized key.

Source

File name: wordpress/wp-includes/formatting.php
Lines:

function sanitize_key( $key ) {
  $sanitized_key = '';

  if ( is_scalar( $key ) ) {
    $sanitized_key = strtolower( $key );
    $sanitized_key = preg_replace( '/[^a-z0-9_\-]/', '', $sanitized_key );
  }

  
/**
 * Filters a sanitized key string.
 *
 * @since 3.0.0
 *
 * @param string $sanitized_key Sanitized key.
 * @param string $key           The key prior to sanitization.
 */
  return apply_filters( 'sanitize_key', $sanitized_key, $key );
}
 

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